4.) block off the rear of the plate and done (like pp's 6th pic). i ghetto fabbed mine and it works fine so far. i simply blocked off the rear opening of the adaptor that overhangs with a small piece of aluminum and then mounted the tb.Three solutions from least work to most work:
1.) Buy 04-05 TSX Manifold
2.) Disable IACV function in KPro and adjust idle mechanically at the throttle body
Refer to step 4 of this to do so http://www.k20a.org/forum/showthread.php?t=68845&highlight=iacv+karcepts
3.) Create an opening at the 06 TSX manifold inlet for IACV. Which is hard because there is not a lot of material.